She says: "The approach to this record is very different than our past two records - it's very performance-based. It's based on whether or not we can all hit it at the same time or whether or not I can hit a note without having to be auto-tuned. It's definitely a challenge."

"We're going back to the beginning - it's the four of us in a room playing the songs that we've worked hard to narrow down and write - it's incredible. I'm so excited every day to wake up and get into the studio.

"Everyone's going after the emotion of it. They're going after the performance and is it magical? That's what we're going after - that amazing performance. We're all on the same level and just riding this wave together."